drivers/usb/host/ehci-ixp4xx.c

   1 /*
   2  * IXP4XX EHCI Host Controller Driver
   3  *
   4  * Author: Vladimir Barinov <vbarinov@embeddedalley.com>
   5  *
   6  * Based on "ehci-fsl.c" by Randy Vinson <rvinson@mvista.com>
   7  *
   8  * 2007 (c) MontaVista Software, Inc. This file is licensed under
   9  * the terms of the GNU General Public License version 2. This program
  10  * is licensed "as is" without any warranty of any kind, whether express
  11  * or implied.
  12  */
  13
  14 #include <linux/platform_device.h>
  15
  16 static int ixp4xx_ehci_init(struct usb_hcd *hcd)
  17 {
  18         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  19         int retval = 0;
  20
  21         ehci->big_endian_desc = 1;
  22         ehci->big_endian_mmio = 1;
  23
  24         ehci->caps = hcd->regs + 0x100;
  25         ehci->regs = hcd->regs + 0x100
  26                 + HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
  27         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  28
  29         hcd->has_tt = 1;
  30         ehci_reset(ehci);
  31
  32         retval = ehci_init(hcd);
  33         if (retval)
  34                 return retval;
  35
  36         ehci_port_power(ehci, 0);
  37
  38         return retval;
  39 }
  40
  41 static const struct hc_driver ixp4xx_ehci_hc_driver = {
  42         .description            = hcd_name,
  43         .product_desc           = "IXP4XX EHCI Host Controller",
  44         .hcd_priv_size          = sizeof(struct ehci_hcd),
  45         .irq                    = ehci_irq,
  46         .flags                  = HCD_MEMORY | HCD_USB2,
  47         .reset                  = ixp4xx_ehci_init,
  48         .start                  = ehci_run,
  49         .stop                   = ehci_stop,
  50         .shutdown               = ehci_shutdown,
  51         .urb_enqueue            = ehci_urb_enqueue,
  52         .urb_dequeue            = ehci_urb_dequeue,
  53         .endpoint_disable       = ehci_endpoint_disable,
  54         .get_frame_number       = ehci_get_frame,
  55         .hub_status_data        = ehci_hub_status_data,
  56         .hub_control            = ehci_hub_control,
  57 #if defined(CONFIG_PM)
  58         .bus_suspend            = ehci_bus_suspend,
  59         .bus_resume             = ehci_bus_resume,
  60 #endif
  61         .relinquish_port        = ehci_relinquish_port,
  62         .port_handed_over       = ehci_port_handed_over,
  63 };
  64
  65 static int ixp4xx_ehci_probe(struct platform_device *pdev)
  66 {
  67         struct usb_hcd *hcd;
  68         const struct hc_driver *driver = &ixp4xx_ehci_hc_driver;
  69         struct resource *res;
  70         int irq;
  71         int retval;
  72
  73         if (usb_disabled())
  74                 return -ENODEV;
  75
  76         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  77         if (!res) {
  78                 dev_err(&pdev->dev,
  79                         "Found HC with no IRQ. Check %s setup!\n",
  80                         dev_name(&pdev->dev));
  81                 return -ENODEV;
  82         }
  83         irq = res->start;
  84
  85         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  86         if (!hcd) {
  87                 retval = -ENOMEM;
  88                 goto fail_create_hcd;
  89         }
  90
  91         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  92         if (!res) {
  93                 dev_err(&pdev->dev,
  94                         "Found HC with no register addr. Check %s setup!\n",
  95                         dev_name(&pdev->dev));
  96                 retval = -ENODEV;
  97                 goto fail_request_resource;
  98         }
  99         hcd->rsrc_start = res->start;
 100         hcd->rsrc_len = res->end - res->start + 1;
 101
 102         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 103                                 driver->description)) {
 104                 dev_dbg(&pdev->dev, "controller already in use\n");
 105                 retval = -EBUSY;
 106                 goto fail_request_resource;
 107         }
 108
 109         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 110         if (hcd->regs == NULL) {
 111                 dev_dbg(&pdev->dev, "error mapping memory\n");
 112                 retval = -EFAULT;
 113                 goto fail_ioremap;
 114         }
 115
 116         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 117         if (retval)
 118                 goto fail_add_hcd;
 119
 120         return retval;
 121
 122 fail_add_hcd:
 123         iounmap(hcd->regs);
 124 fail_ioremap:
 125         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 126 fail_request_resource:
 127         usb_put_hcd(hcd);
 128 fail_create_hcd:
 129         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), retval);
 130         return retval;
 131 }
 132
 133 static int ixp4xx_ehci_remove(struct platform_device *pdev)
 134 {
 135         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 136
 137         usb_remove_hcd(hcd);
 138         iounmap(hcd->regs);
 139         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 140         usb_put_hcd(hcd);
 141
 142         return 0;
 143 }
 144
 145 MODULE_ALIAS("platform:ixp4xx-ehci");
 146
 147 static struct platform_driver ixp4xx_ehci_driver = {
 148         .probe = ixp4xx_ehci_probe,
 149         .remove = ixp4xx_ehci_remove,
 150         .driver = {
 151                 .name = "ixp4xx-ehci",
 152         },
 153 };